The stock paper air filter is quite restrictive and
changing to a Hi-Flow Air Filter will allow the turbo to spool up
easier and in most cases you will hear the turbo whirring as it pulls more air.
To help the air flow better I also recommend removing the restriction in the
fender, some call this part the "snorkel",
even though it has nothing to do with water.

Note:
I recommend removing the air box completely whenever replacing 6.5 turbo diesel air filters
to make sure the box is clean and the filter is fitting correctly, this is
especially important with other make filters. Click here
for info and pictures on air box and "snorkel" removal.

Allowing the engine to breathe better will add efficiency
and performance and should help increase mpg, provided you maintain the same
driving habits, but sometimes it's hard to resist using the added power.

Since 1978 I have used the K&N washable
air filters which are the oil impregnated cotton gauze (OICG)
type. We found that were good for performance applications, but over the
last few years other companies have produced similar filters, we found one
company who makes very high quality filters and we met with them to discuss our
needs. These filters IMHO they are much better quality, the deeper pleat
design creates more surface air area which allow greater flow and as the filter
gets dirty the flow and filtration stays good longer.

If you are considering any "FOAM" type
filters. Click here
to read the WARNING
about foam air filters.

With many other filters it's all too common for the seal
to deform allowing unfiltered air to pass by the filter. I find the seal on
these to be much better quality and have not seen any indication of possible
deformation.

Click image to enlarge

Click image to enlarge

The photo above shows the our red filter (red) note
the nice rectangular shape, straight sides then how this compares to the
compared to the other (black), note the mis-shaped look of the seal.

Click image to enlarge

The photo above the wire mesh on the other filter is
not properly covered by the seal material, note the more exacting shape of our
filter.

In our testing after installing our filters I
noticed an immediate power gain and could hear and notice the turbo spool up
faster.

Click image to enlarge

Pictured above are the 3 common GM diesel air
filters which are available and we try to keep in stock, air filters for most
other make and model vehicles are available too! From left to right; they
are 1992 to 1995 GM 6.5 Turbo Diesel and some 1996, (flat filter);
some 1996 and all 1997 to 2000 GM 6.5 Turbo Diesel (cylindrical filter);
2001 and up Duramax 6.6 Turbo Diesel (flat filter).

Disclaimer:
Some products can adjust and/or increase power levels beyond factory parameters,
so their use could possibly void your warranty, and may not be
legal for use on emission controlled vehicles in some areas, due to these facts
buyer accepts all responsibility for use, and his/her actions, there is no
warranty either expressed or implied as to use of products, improper
installation, settings and/or use of such could possibly cause property damage
and or personal injury. The
Magnus-Moss Warranty Act prohibits a dealer or manufacturer from voiding
your warranty unless a product is directly responsible for a failure.
Although effort has been made to try to present accurate information this
website, it can contain some opinion, conjecture, errors, mistakes and typos so
use any information with that in mind and if in doubt research anything you do
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